The following plot is used to evaluate how well the operators are following the basic drilling sequence: Navigate to hole, start drilling, end drilling, navigate to hole. If they follow this basic sequence, all drill records will only record a small movemente of the equipment during drilling beacuse of the leveling action and vibration. If there is a movement of more than a fraction of a meter during drilling time, it will indicate that the operator didn’t record the sequence correctly and moved the drill before finishing the hole or started the hole before the end of tramming. For reference the number by the operator name is the total number of holes recorded.
Good operators will have a distribution to the left of the plot and a very small percent of holes on the right end (recorded movement of 20 meters or more). It can be seen that, with exception of three operators, most of them are following the right sequence and have a very low percent of holes with recorded movement over 2 meters. Operators that need training are Ricardo Martinez and Yesid Maestre. Luis Leon also has a high percentage but this was only based on seven drilled holes.
Figure 1: Equipment Movement During Drill Time
Figure 2 displays a distribution of the leveling time by operator. The number by the operator name is the total number of holes recorded. If the leveing time is 20 seconds or more these holes will be added to the last column on the right. Please note that any hole with a leveling time greater than 120 seconds will be displayed on red. A good operator should have most of the percentage of drilled holes on the 20 second column, however a considerable fraction of this column colored in red would also indicate an operator not following the sequence correctly.
Again most operators seem to be doing an good job recording the leveling time with over 60% of drilled holes recording at least 20 seconds of leveling time. On the other hand, operator Yesid Maestre does not seem to be recording leveling times at all, while operators: Pena, Zorrilla and Sanchez need more training on the leveling action sequence.
Figure 2: Leveling Time Distribution by Operator
The following two plots show the distance to the target position (planned hole) before leveling the drill on the X axis and the distance to the target position (planned hole) after leveling the drill on the X axis. Each drilled hole is represented by a dot colored red for drill 3131 and colored gray for drill 3166 (mouse over on the dot for drill hole details). On Figure 3 the x and y axis have a range of 4 meters. This is used to show how many holes are being drilled far away from the target position.
Figure 3: Distance to Target After Leveling vs. Before Leveling
A more detailed view into the 1 meter range, shows that some of the holes end several tens of cm away from the initial distance to target after leveling.
Figure 4: Distance to Target After Leveling vs. Before Leveling